Today we're going to discuss the history of the bicycle. In the early 19th century, the first two-wheeled vehicle, called a 'draisine', was invented by Karl von Drais. It had no pedals; riders pushed their feet against the ground to move. Later, in the 1860s, pedals were added to the front wheel, creating the 'velocipede'. However, this design was uncomfortable due to its rigid frame. By the 1880s, the 'safety bicycle' with a chain drive and equal-sized wheels became popular, making cycling safer and more accessible. This design is essentially what we still use today.
❓ What was the main improvement of the 'safety bicycle' compared to earlier designs?
A. A. It had pedals attached to the front wheel.
B. B. It used a chain drive and equal-sized wheels for better stability.
C. C. It was lighter because it was made of wood.
D. D. It required riders to push their feet on the ground.
✅ 正确答案
B. It used a chain drive and equal-sized wheels for better stability.